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PDF AS3647B Data sheet ( Hoja de datos )
| Número de pieza | AS3647B | |
| Descripción | 1600mA High Current LED Flash Driver | |
| Fabricantes | austriamicrosystems | |
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Datasheet
AS3647/47B
1600mA High Current LED Flash Driver
1 General Description
The AS3647/47B is an inductive high efficient DCDC
step up converter with two current sinks. The DCDC
step up converter operates at a fixed frequency of 4MHz
and includes soft startup to allow easy integration into
noise sensitive RF systems. The two current sinks can
operate in flash / torch / assist (=video) light modes.
The AS3647/47B includes flash timeout, overvoltage,
overtemperature, undervoltage and LED short circuit
protection functions. A TXMASK/TORCH function
reduces the flash current in case of parallel operation to
the RF power amplifier and avoids a system shutdown.
Alternatively this pin can be used to directly operate the
torch light directly.
The AS3647/47B is controlled by an I2C interface and
has a hardware automatic shutdown if SCL=0 for
100ms. Therefore no additional enable input is required
for shutting down of the device once the system shuts
down.
The AS3647/47B is available in a space-saving WL-
CSP package measuring only 2.25x1.5x0.6mm
(AS3647B: 2.25x1.5x0.5mm) and operates over the -
30ºC to +85ºC temperature range.
Figure 1. Typical Operating Circuit
2 Key Features
High efficiency 4MHz fixed frequency DCDC Boost
converter with soft start allows small coils
- Stable even in coil current limit
LED current adjustable up to 1600mA
Automatic current adjustment for low battery voltage
PWM operation for lower output current for reliable
light output of the LED; running at 31.25kHz to avoid
audible noise
Protection functions:
Automatic Flash Timeout timer to protect the LED(s)
Overvoltage and undervoltage Protection
Overtemperature Protection
LED short/open circuit protection
I2C Interface with automatic shutdown
5V constant voltage mode operation
Available in tiny WL-CSP Packages, 13 balls 0.5mm
pitch 2.25x1.5x0.6mm, 15 balls 0.4mm pitch
2.25x1.5x0.5mm package size
3 Applications
Flash/torch/videolight for smartphones, feature-phones,
tablets, DSCs, DVCs
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www.austriamicrosystems.com/AS3647
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1.5-4
1 - 37
1 page  
AS3647/47B
Datasheet, Confidential - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in Table 4, “Electrical
Characteristics,” on page 6 is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 3. Absolute Maximum Ratings
Parameter
Min Max Units
Comments
VIN to GND
-0.3 +7.0
V
STROBE, TXMASK/TORCH, SCL, SDA to
GND
-0.3
VIN +
0.3
V
max. +7V
SW1/2/3, VOUT1/2, LED_OUT1/2 to GND -0.3 +7.0
VOUT1/2 to SW1/2/3
-0.3
V
V
Note: Diode between VOUT1/2 and
SW1/2/3
voltage between 2xGND, GNDA pins
0.0
Input Pin Current without causing latchup
-100
Continuous Power Dissipation (TA = +70ºC)
Continuous power dissipation
Continuous power dissipation derating factor
Electrostatic Discharge
ESD HBM
pins LED_OUT1/23
ESD HBM
ESD CDM
ESD MM
Temperature Ranges and Storage Conditions
0.0
+100
+IIN
V
mA
1230
16.7
mW
mW/ºC
±8000
±2000
±500
±100
V
V
V
V
short connection recommended
Norm: EIA/JESD78
PT at 70ºC1
PDERATE2
Norm: JEDEC JESD22-A114F
Norm: JEDEC JESD 22-C101E
Norm: JEDEC JESD 22-A115-B
Junction to ambient thermal resistance
Junction Temperature
Storage Temperature Range
Humidity
Body Temperature during Soldering
For more information about thermal
604
ºC/W
metrics, see application note AN01
Thermal Characteristics
+150
ºC
Internally limited (overtemperature
protection), max. 20000s
-55 +125
ºC
5 85 %
Non condensing
+260 ºC according to IPC/JEDEC J-STD-020
Moisture Sensitivity Level (MSL)
MSL 1
Represents a max. floor life time of
unlimited
1. Depending on actual PCB layout and PCB used measured on demoboard; for peak power dissipation during
flashing see document 'AS3647/47B Thermal Measurements'
2. PDERATE derating factor changes the total continuous power dissipation (PT) if the ambient temperature is not
70ºC. Therefore for e.g. TAMB=85ºC calculate PT at 85ºC = PT - PDERATE * (85ºC - 70ºC)
3. Pins LED_OUT1 connected to LED_OUT2 and capacitor CVOUT connected to VOUT1/2 and GND; both GND
pins connected together
4. Measured on AS3647/47B Demoboard.
www.austriamicrosystems.com/AS3647
1.5-4
5 - 37
5 Page 
AS3647/47B
Datasheet, Confidential - Typical Operating Characteristics
Figure 11. ILED Startup (ILED_OUT=60mA)
Figure 12. VOUT / ILED_OUT ripple, ILED_OUT = 1.0A
Figure 13. ILED Rampdown (ILED_OUT=1.0A)
Figure 15. Oscillator frequency fCLK vs. TAMB
4.2
4.1
MHz
4.0
3.9
3.8
-30
-10 10 30 50 70
Ambient Temperature (C)
www.austriamicrosystems.com/AS3647
Figure 14. ILED_OUT vs. TAMB
63
62
61
mA
60
59
58
-30
-10 10 30 50 70
Ambient Temperature (C)
Figure 16. Flash Timeout
1.5-4
11 - 37
11 Page | ||
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| PDF Descargar | [ Datasheet AS3647B.PDF ] | |
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